Milking-machine.



C. BOK'ALRUD.

MILKING MACHINE.

Arrmouron FILED JUNE 9,1911.

.Patnted Fbf13, 1912. 4 s'snnn's-sxnnfr 1.

T3' yl.

www eooszo C. BOKALRUD.-

MILKING MACHINE. P.rLxoAuzIxsrv 17mm mm: 9, 1911.

Patented Feb. 13, 1912.

3 SHEETS-SHEET 2.

C. BOKALRUD.

mums Mmmm. APPLICATION FILED JUE?. 9, 1911.

Patented Feb.'13,1912.

UNITED sTATEs PATENT o EEIoE.

CHRISTOPHER IBOKALRUD, F MCINTOSH, SOUTH DAKOTA.

MILKINGr-MACHIE.

To altwhom it may concern;

Be itknown that I,l CHRISTOPHER BOKAL- i RUD, a citizen of the United States, residing at McIntosh, in the cofintv ofl Corson and State of South Dakota have invented new and useful Improvements in Milking-Ma! chines, of which the following is a specificai tion.

The present invention provides a machine for great-ly facilitating the milking operation when collecting the fluid and enables the work to be quickly'and effectively pertunity fuor the same to pass'y back into the udder,

The invention further provides novel mountings for the pressure plates and actuating means therefor of peculiar structure whereby the pressure is gradually applied to the plates from top to bottom.

The yinvention consists of the novel features, details of construction and combination of parts, which hereinafter will be more particularly set forth, illustrated' in the-accompanying drawings, andV pointed out in the appended claims.

Referring to the drawings, forming a part of the speciiication, Figure 1 is a de'- tail view, showing` the machine in all Lits.

essential parts. Fig. 2 is a 'top plan view of the machine. Fig. 3' is a longitudinal section on the line of Fig. 2. Fig. 4 is a transverse s'ction on the line g/'-g/ of Fig. 2. Fig. 5 is a side view partly in sec tion. Fig. 6 is a detail View, showing the initial operation of the eccentric whereby,

the upper edges of the pressure plates are brought together. Figc 7 is a View similar to Fig.v 6, showingthe positiony of the parts when the eccentric is about to release the pressure plates.

to in the following descrlption, and indicated in all the views of the-drawings, by the same reference characters.

The machine embodies a frame which comprises end plates 1 and tie rods `2, the

v .latter connecting the end plates 1 andhav- Spe'cication of Letters Patent.

Application led .Tune 9, 1911. Serial No. 632,160.

Corresponding and like parts are referred.

Patented Peb. 13, 1912.

ing their end portionsV threaded and provided with pairs of nuts between which the end'plates are secured. Two plates 3 are mounted upon `the tie rods and are free to move thereon and constitute the innerpressure plates. A covering 4 is applied to the outer sides of the plates 3 and may consist of rubber or other yieldable material to prevent injurious pressure. The covering 4 has a hook at its upper edge which engages over the plate so as to hold the oo ver in place and admit of its removal for sanitary purposes or to be readily replacedas occasion may require. connect the plates 3 with the plates 1 and consistof threaded rods 5, springs 6 and set tubes 7, the latter passing through open ings formed in the platesl and receiving the outer threaded ends of the rods 5, the springs 6 connecting the inner ends of the threaded rods with the pressure plates 3.v

Other pressure plates 8 are loosely mounted upon the upper tie rods, their lower vends being free. Screw eyes 9 are let into' the ends of the pressure plates 8 and are mounted upon the upper tie rods. and are connected with blocks 10 and 1,1by means of springs 12. The blocks 11 are loose upon the upper and lower side tie rods,l whereas the blocks 10 are loose upon the two upper intermediate tie rods. The springs 12.,are helical and contractile in nature so as normally to hold the pressure plates ASraway from the pressure plates. The outer sides of the pressure plates 8 are made concave,

as indicated at 13. The outer pressure Yieldable 'means plates 8 may be oirubber` or any other `Inel terialpresenting a yieldable surface to pre-4 vent injury when the machine is. in opera-l tion. v The side blocks 11 are adjustable and between the blocks 11 andthe end plates 1 consist of threaded rods 14, set tubes l5V having screw threadconnection with' the rods 14 and helical -springs 16 mounted upon setey tubes 15 and confined between stop flanges at the inner ends of said set tubes and the end plates l. The springs 16 are expansible and adapted to kbe compressed when the blocks 11 are pressed outwardly. The threaded rods 5 pass'loos'ely through the blocks 11. The blocks 10 have va relaably and adjustably connected withthe end yieldably connect with the end plates `The yieldable and adjustable connections 11o tive horizontal arrangement and are yieldplates 1 in a vmarmer similar to the 'blocks 11 rlhreaded rods 17 and set tubes 18 I' form the connecting means between the blocks l and the end plate'sl. .llt will be understood that the outer pressure plates 8.

. are yieldably connected with the blocks 10 v,and 11 and said blocks in turn'lare. both by each comes into play during one half of each revolution of the shaft. 'There are practically four pressure devices and four eccentric rolls,`each of the pressure devices being designed for cooperation with a teat during the milking operation.

The shafts 20 are adapted. to be rotated at a uniform speed .in opposite directions, thereb moving the outer pressure plates 8 inwardly in successive order. As the shafts 20 rotate the eccentric rolls first engage with the upper portion of the outer pressure plates and move the same inward, thereby gripping the base of the teat between the` inner and outeri pressure plates and as the eccentric continues its rotation the line of pressure4 upon the outer plate moves from top 'to bottom, thereby gradually bringing the pressure plates together so as to compress the teat from base to point to insure expressing all the fluid therefrom. After the eccentric clears the pressure plate the latter moves' outward by the action of the springs l2, thereby releasing thefteat which is permitted to ll before the-next movement of the `outer pressure plate.' 'It is noted that the operation is by a gradual compressive action and that the teat is not liable to injury resulting from -abrasive action by moving thereover. The pressurer plates simply move inward land outward, the rubbing action being between the ieccentric roll and the outer pressure plate, the disposition 'of the parts bemg such as to bring the upper edges of the pressure plates. together to compress the base portion of the `teat and subsequently to gradually bring the plates together to force the iuid from the teat.

By compressing the base portion of the teat the fluidI is prevented from being forced backward into the udder.

The framework is adapted to be closed at its bottom and sides by means of a cover 22, which preferably slopes to a central point at which a discharge opening is formed. A strainer 23 covers the discharge 'opening and a tube 24: leads from the opening in the bottom of the cover to convey the milk to a convenient oint of discharge. For operating the sha s 20 a flexible shaft 25 is com the operation of a part' torneos nected to each andA extends to a counter which the ends of a back strap 28 are connected,said back strap being passed over the back of the cow in such a manner as .to support the machine in proper position for the milking operation. interposed between the back and the strap 28. y, f

From the -foregoing description, taken Iin connection with the accompanying drawings, the advantages of the construction and of the method `of operation will be readily A pad 29 is pro--l vided at opposite ends with handles 27 to of the animal apparent to those skilled in the art to which the myentionfappertains, and whilelhavel described the principle ofvoperation of the invention, together with the device which I now consider to be the embodiment thereof,-

I desire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired as are within the. scope of the claims appendedhereto. l y

Having thus described the invention. what is claimed as new, is

l. A milking machine comprising pressure plates, yieldable supporting means for the pressure plates, means for relatively adjusting the yieldable supporting means to properly position the pressure plates and to regulate the space between them, a compressing device for advancing the pressure plates, and yieldable supporting means for the pressing means.

2. In a milking' machine, the combination of a pair of pressure plates, yieldable supporting means therefor, one of the pressure plates having a concave recess in its outer side, and an eccentric compressing device to sweep across the concave depression of the pressure plates to gradually move the same toward the opposite pressure plate for gradually compressing the teat from base to point.

3, In a milking machine, the combination of a pair of pressure plates, slidably mounted blocks, yieldable connections between one of the pressure plates and the slidable blocks, yieldable and'adjustable. connecting means between the other pressure plate and the framework, other yieldable and adjustable connecting means between the slidable blocks and the framework, a shaft mounted in the said blocks, and an eccentric mounted upon said shaft and adapted to engage the adjacent moving, the saine toward the companion pressure plate.

4. A. milking machine comprising a frame- ;wLork embodying end plates and tie rods,

pressure plate for gradually f a pressure plate mountedupon the tie rodsL,

. plate of the frame, outer pressure plates mounted upon the tie rods, blocks slidably mounted. upon the side tie rods, .yieldable a second block slidably mounted uponlthe intermediate tie rods, yieldable connecting means between the inner ends of the pressure plates and the intermediate slide block,

yieldable and adjustable connecting means ble-.tween the intermediate and side blocks and the` adjacent end plateV of the frame, a shaft mounted in the side b1ocks, and eccentries mounted upon said shaft andvhaving a diametri@ arrangement to alternately .en-

, gage the outer pressure plates. connections between said blocks and the outei ends of the adjacent pressure plates,

In testimony whereof I atlx my signature 1n presence of two witnesses.

`CHRISTOPI-IER BOKALRUD.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. y 

